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Disambiguated: dyad → Binary function |
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Strictly, no formal definition can be provided which applies to every [[programming language]], since each of them has its own concepts, [[Formal semantics of programming languages|semantics]] and terminology; the term may not even be applicable or, to the contrary, applied with a very specific meaning in the context of a given language.
In the case of [[APL programming language|APL]] the notion applies to every operand; and [[Binary function|dyad]]s ("binary functions") have a ''left rank'' and a ''right rank''.
The box below instead shows how ''rank of a type'' and ''rank of an array expression'' could be defined (in a semi-formal style) for C++ and illustrates a simple way to calculate them at compile time.
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